{"id":1549,"date":"2022-11-11T21:49:36","date_gmt":"2022-11-11T13:49:36","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1549"},"modified":"2022-11-27T12:40:58","modified_gmt":"2022-11-27T04:40:58","slug":"mysql%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e6%a6%82%e8%bf%b0_%e5%ad%97%e7%ac%a6%e9%9b%86%e8%ae%be%e7%bd%ae%e3%80%81%e6%95%b4%e5%9e%8b%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b%e8%ae%b2%e8%a7%a3%e3%80%81","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1549","title":{"rendered":"MySQL\u6570\u636e\u7c7b\u578b\u6982\u8ff0_\u5b57\u7b26\u96c6\u8bbe\u7f6e\u3001\u6574\u578b\u6570\u636e\u7c7b\u578b\u8bb2\u89e3\u3001\u6d6e\u70b9\u6570\u3001\u5b9a\u70b9\u6570\u4e0e\u4f4d\u7c7b\u578b\u8bb2\u89e3\u3001\u65e5\u671f\u65f6\u95f4\u7c7b\u578b\u8bb2\u89e3\u3001\u6587\u672c\u5b57\u7b26\u4e32\u7c7b\u578b\uff08\u542bENUM\u3001SET\uff09\u8bb2\u89e3\u3001\u4e8c\u8fdb\u5236\u7c7b\u578b\u4e0eJSON\u7c7b\u578b\u8bb2\u89e3\u3001\u5c0f\u7ed3\u53ca\u7c7b\u578b\u4f7f\u7528\u5efa\u8bae"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c12\u7ae0_MySQL\u6570\u636e\u7c7b\u578b\u7cbe\u8bb2\r\n# \u672c\u7ae0\u7684\u5185\u5bb9\u6d4b\u8bd5\u5efa\u8bae\u4f7f\u7528 MySQL5.7\u8fdb\u884c\u6d4b\u8bd5\u3002\r\n\r\n# 1. \u5173\u4e8e\u5c5e\u6027\uff1acharacter set name\r\n\r\nSHOW VARIABLES LIKE 'character_%';\r\n\r\n#\u521b\u5efa\u6570\u636e\u5e93\u65f6\u6307\u660e\u5b57\u7b26\u96c6\r\nCREATE DATABASE IF NOT EXISTS dbtest12 CHARACTER SET 'utf8';\r\n\r\nSHOW CREATE DATABASE dbtest12;\r\n\r\n#\u521b\u5efa\u8868\u7684\u65f6\u5019\uff0c\u6307\u660e\u8868\u7684\u5b57\u7b26\u96c6\r\nCREATE TABLE temp(\r\n    id INT\r\n) CHARACTER SET 'utf8';\r\n\r\nSHOW CREATE TABLE temp;\r\n\r\n#\u521b\u5efa\u8868\uff0c\u6307\u660e\u8868\u4e2d\u7684\u5b57\u6bb5\u65f6\uff0c\u53ef\u4ee5\u6307\u660e\u5b57\u6bb5\u7684\u5b57\u7b26\u96c6\r\nCREATE TABLE temp1(\r\n    id INT,\r\n    name VARCHAR(15) CHARACTER SET 'gbk'\r\n);\r\n\r\nSHOW CREATE TABLE temp1;\r\n\r\n# 2. \u6574\u5f62\u6570\u636e\u7c7b\u578b\r\n\r\nUSE dbtest12;\r\n\r\nCREATE TABLE test_int1(\r\n    f1 TINYINT,\r\n    f2 SMALLINT,\r\n    f3 MEDIUMINT,\r\n    f4 INTEGER,\r\n    f5 BIGINT\r\n);\r\n\r\nDESC test_int1;\r\n\r\nINSERT INTO test_int1(f1)\r\nVALUES (12),(-12),(-128),(127);\r\n\r\nSELECT * FROM test_int1;\r\n\r\n# Out of range value for column 'f1' at row 1\r\nINSERT INTO test_int1(f1)\r\nVALUES(128);\r\n\r\nCREATE TABLE test_int2(\r\n    f1 INT,\r\n    f2 INT(5),\r\n    f3 INT(5) ZEROFILL  #\u2460 \u663e\u793a\u5bbd\u5ea6\u4e3a5\u3002\u5f53INSERT\u7684\u503c\u4e0d\u8db35\u4f4d\u65f6\uff0c\u4f7f\u75280\u586b\u5145\u3002\u2461 \u5f53\u4f7f\u7528ZEROFILL\u65f6\uff0c\u81ea\u52a8\u4f1a\u6dfb\u52a0UNSIGNED\r\n);\r\n\r\nINSERT INTO test_int2(f1,f2)\r\nVALUES(123,123),(123456,123456);\r\n\r\nSELECT * FROM test_int2;\r\n\r\nINSERT INTO test_int2(f3)\r\nVALUES(123),(123456);\r\n\r\nSHOW CREATE TABLE test_int2;\r\n\r\nCREATE TABLE test_int3(\r\n    f1 INT UNSIGNED\r\n);\r\n\r\nDESC test_int3;\r\n\r\nINSERT INTO test_int3\r\nVALUES(2412321);\r\n\r\nINSERT INTO test_int3\r\nVALUES(4294967296);\r\n\r\n# 3. \u6d6e\u70b9\u7c7b\u578b\r\nCREATE TABLE test_double1(\r\n    f1 FLOAT,\r\n    f2 FLOAT(5,2),\r\n    f3 DOUBLE,\r\n    f4 DOUBLE(5,2)\r\n);\r\n\r\nDESC test_double1;\r\n\r\nINSERT INTO test_double1(f1,f2)\r\nVALUES(123.45,123.45);\r\n\r\nSELECT * FROM test_double1;\r\n\r\nINSERT INTO test_double1(f3,f4)\r\nVALUES(123.45,123.456); #\u5b58\u5728\u56db\u820d\u4e94\u5165\r\n\r\n# Out of range value for column 'f4' at row 1\r\nINSERT INTO test_double1(f3,f4)\r\nVALUES(123.45,1234.456);\r\n\r\n# Out of range value for column 'f4' at row 1\r\nINSERT INTO test_double1(f3,f4)\r\nVALUES(123.45,999.995);\r\n\r\n#\u6d4b\u8bd5FLOAT\u548cDOUBLE\u7684\u7cbe\u5ea6\u95ee\u9898\r\nCREATE TABLE test_double2(\r\nf1 DOUBLE\r\n);\r\n\r\nINSERT INTO test_double2\r\nVALUES(0.47),(0.44),(0.19);\r\n\r\nSELECT SUM(f1)\r\nFROM test_double2;\r\n\r\nSELECT SUM(f1) = 1.1,1.1 = 1.1\r\nFROM test_double2;\r\n\r\n# 4. \u5b9a\u70b9\u6570\u7c7b\u578b\r\nCREATE TABLE test_decimal1(\r\n    f1 DECIMAL,\r\n    f2 DECIMAL(5,2)\r\n);\r\n\r\nDESC test_decimal1;\r\n\r\nINSERT INTO test_decimal1(f1)\r\nVALUES(123),(123.45);\r\n\r\nSELECT * FROM test_decimal1;\r\n\r\nINSERT INTO test_decimal1(f2)\r\nVALUES(999.99);\r\n\r\nINSERT INTO test_decimal1(f2)\r\nVALUES(67.567); #\u5b58\u5728\u56db\u820d\u4e94\u5165\r\n\r\n# Out of range value for column 'f2' at row 1\r\nINSERT INTO test_decimal1(f2)\r\nVALUES(1267.567);\r\n\r\n# Out of range value for column 'f2' at row 1\r\nINSERT INTO test_decimal1(f2)\r\nVALUES(999.9995);\r\n\r\n#\u6f14\u793aDECIMAL\u66ff\u6362DOUBLE, \u4f53\u73b0\u7cbe\u5ea6\r\nALTER TABLE test_double2\r\nMODIFY f1 DECIMAL(5,2);\r\n\r\nDESC test_double2;\r\n\r\nSELECT SUM(f1)\r\nFROM test_double2;\r\n\r\nSELECT SUM(f1) = 1.1,1.1 = 1.1\r\nFROM test_double2;\r\n\r\n# 5. \u4f4d\u7c7b\u578b\uff1aBIT\r\nCREATE TABLE test_bit1(\r\nf1 BIT,\r\nf2 BIT(5),\r\nf3 BIT(64)\r\n);\r\n\r\nDESC test_bit1;\r\n\r\nINSERT INTO test_bit1(f1)\r\nVALUES(0),(1);\r\n\r\nSELECT *\r\nFROM test_bit1;\r\n\r\n# Data too long for column 'f1' at row 1\r\nINSERT INTO test_bit1(f1)\r\nVALUES(2);\r\n\r\nINSERT INTO test_bit1(f2)\r\nVALUE(31);\r\n\r\n# Data too long for column 'f1' at row 1\r\nINSERT INTO test_bit1(f2)\r\nVALUE(32);\r\n\r\nSELECT BIN(f1),BIN(f2),HEX(f1),HEX(f2)\r\nFROM test_bit1;\r\n\r\n#\u6b64\u65f6+0\u4ee5\u540e\uff0c\u53ef\u4ee5\u4ee5\u5341\u8fdb\u5236\u7684\u65b9\u5f0f\u663e\u5f0f\u6570\u636e\r\nSELECT f1 + 0, f2 + 0\r\nFROM test_bit1;\r\n\r\n# 6.1 YEAR\u7c7b\u578b\r\nCREATE TABLE test_year(\r\n    f1 YEAR,\r\n    f2 YEAR(4)\r\n);\r\n\r\nDESC test_year;\r\n\r\nINSERT INTO test_year(f1)\r\nVALUES('2021'),(2022);\r\n\r\nSELECT * FROM test_year;\r\n\r\nINSERT INTO test_year(f1)\r\nVALUES ('2155');\r\n\r\n# Out of range value for column 'f1' at row 1\r\nINSERT INTO test_year(f1)\r\nVALUES ('2156');\r\n\r\nINSERT INTO test_year(f1)\r\nVALUES ('69'),('70');\r\n\r\nINSERT INTO test_year(f1)\r\nVALUES (0),('00');\r\n\r\n# 6.2 DATE\u7c7b\u578b\r\n\r\nCREATE TABLE test_date1(\r\n    f1 DATE\r\n);\r\n\r\nDESC test_date1;\r\n\r\nINSERT INTO test_date1\r\nVALUES ('2020-10-01'), ('20201001'),(20201001);\r\n\r\nINSERT INTO test_date1\r\nVALUES ('00-01-01'), ('000101'), ('69-10-01'), ('691001'), ('70-01-01'), ('700101'),('99-01-01'), ('990101');\r\n\r\nINSERT INTO test_date1\r\nVALUES (000301), (690301), (700301), (990301);  #\u5b58\u5728\u9690\u5f0f\u8f6c\u6362\r\n\r\nINSERT INTO test_date1\r\nVALUES (CURDATE()),(CURRENT_DATE()),(NOW());\r\n\r\nSELECT *\r\nFROM test_date1;\r\n\r\n# 6.3 TIME\u7c7b\u578b\r\nCREATE TABLE test_time1(\r\n    f1 TIME\r\n);\r\n\r\nDESC test_time1;\r\n\r\nINSERT INTO test_time1\r\nVALUES('2 12:30:29'), ('12:35:29'), ('12:40'), ('2 12:40'),('1 05'), ('45');\r\n\r\nINSERT INTO test_time1\r\nVALUES ('123520'), (124011),(1210);\r\n\r\nINSERT INTO test_time1\r\nVALUES (NOW()), (CURRENT_TIME()),(CURTIME());\r\n\r\nSELECT *\r\nFROM test_time1;\r\n\r\n# 6.4 DATETIME\u7c7b\u578b\r\nCREATE TABLE test_datetime1(\r\n    dt DATETIME\r\n);\r\n\r\nINSERT INTO test_datetime1\r\nVALUES ('2021-01-01 06:50:30'), ('20210101065030');\r\n\r\nINSERT INTO test_datetime1\r\nVALUES ('99-01-01 00:00:00'), ('990101000000'), ('20-01-01 00:00:00'),('200101000000');\r\n\r\nINSERT INTO test_datetime1\r\nVALUES (20200101000000), (200101000000), (19990101000000), (990101000000);\r\n\r\nINSERT INTO test_datetime1\r\nVALUES (CURRENT_TIMESTAMP()), (NOW());\r\n\r\nSELECT *\r\nFROM test_datetime1;\r\n\r\n# 6.5 TIMESTAMP\u7c7b\u578b\r\nCREATE TABLE test_timestamp1(\r\n    ts TIMESTAMP\r\n);\r\n\r\nINSERT INTO test_timestamp1\r\nVALUES ('1999-01-01 03:04:50'), ('19990101030405'), ('99-01-01 03:04:05'),('990101030405');\r\n\r\nINSERT INTO test_timestamp1\r\nVALUES ('2020@01@01@00@00@00'), ('20@01@01@00@00@00');\r\n\r\nINSERT INTO test_timestamp1\r\nVALUES (CURRENT_TIMESTAMP()), (NOW());\r\n\r\n#Incorrect datetime value\r\nINSERT INTO test_timestamp1\r\nVALUES ('2038-01-20 03:14:07');\r\n\r\nSELECT *\r\nFROM test_timestamp1;\r\n\r\n#\u5bf9\u6bd4DATETIME \u548c TIMESTAMP\r\nCREATE TABLE temp_time(\r\n    d1 DATETIME,\r\n    d2 TIMESTAMP\r\n);\r\n\r\nINSERT INTO temp_time VALUES('2021-9-2 14:45:52','2021-9-2 14:45:52');\r\n\r\nINSERT INTO temp_time VALUES(NOW(),NOW());\r\n\r\nSELECT * FROM temp_time;\r\n\r\n#\u4fee\u6539\u5f53\u524d\u7684\u65f6\u533a\r\nSET time_zone = '+9:00';\r\n\r\nSELECT * FROM temp_time;\r\n\r\n# 7.1 CHAR\u7c7b\u578b\r\nCREATE TABLE test_char1(\r\n    c1 CHAR,\r\n    c2 CHAR(5)\r\n);\r\n\r\nDESC test_char1;\r\n\r\nINSERT INTO test_char1(c1)\r\nVALUES('a');\r\n\r\n# Data too long for column 'c1' at row 1\r\nINSERT INTO test_char1(c1)\r\nVALUES('ab');\r\n\r\nINSERT INTO test_char1(c2)\r\nVALUES('ab');\r\n\r\nINSERT INTO test_char1(c2)\r\nVALUES('hello');\r\n\r\nINSERT INTO test_char1(c2)\r\nVALUES('\u5c1a');\r\n\r\nINSERT INTO test_char1(c2)\r\nVALUES('\u7845\u8c37');\r\n\r\nINSERT INTO test_char1(c2)\r\nVALUES('\u5c1a\u7845\u8c37\u6559\u80b2');\r\n\r\n# Data too long for column 'c2' at row 1\r\nINSERT INTO test_char1(c2)\r\nVALUES('\u5c1a\u7845\u8c37IT\u6559\u80b2');\r\n\r\nSELECT * FROM test_char1;\r\n\r\nSELECT CONCAT(c2,'***')\r\nFROM test_char1;\r\n\r\nINSERT INTO test_char1(c2)\r\nVALUES('ab  ');\r\n\r\nSELECT CHAR_LENGTH(c2)\r\nFROM test_char1;\r\n\r\n# 7.2 VARCHAR\u7c7b\u578b\r\nCREATE TABLE test_varchar1(\r\n    name VARCHAR    #\u9519\u8bef\r\n);\r\n\r\n# Column length too big for column 'name' (max = 21845); use BLOB or TEXT instead\r\nCREATE TABLE test_varchar2(\r\n    name VARCHAR(65535)\r\n);\r\n\r\nCREATE TABLE test_varchar3(\r\nNAME VARCHAR(5)\r\n);\r\n\r\nINSERT INTO test_varchar3\r\nVALUES('\u5c1a\u7845\u8c37'),('\u5c1a\u7845\u8c37\u6559\u80b2');\r\n\r\n#Data too long for column 'NAME' at row 1\r\nINSERT INTO test_varchar3\r\nVALUES('\u5c1a\u7845\u8c37IT\u6559\u80b2');\r\n\r\n# 7.3 TEXT\u7c7b\u578b\r\nCREATE TABLE test_text(\r\n    tx TEXT\r\n);\r\n\r\nINSERT INTO test_text\r\nVALUES('atguigu   ');\r\n\r\nSELECT CHAR_LENGTH(tx)\r\nFROM test_text; #10\r\n\r\n# 8. ENUM\u7c7b\u578b\r\nCREATE TABLE test_enum(\r\n    season ENUM('\u6625','\u590f','\u79cb','\u51ac','unknow')\r\n);\r\n\r\nINSERT INTO test_enum\r\nVALUES('\u6625'),('\u79cb');\r\n\r\nSELECT * FROM test_enum;\r\n\r\n# Data truncated for column 'season' at row 1\r\nINSERT INTO test_enum\r\nVALUES('\u6625,\u79cb');\r\n# Data truncated for column 'season' at row 1\r\nINSERT INTO test_enum\r\nVALUES('\u4eba');\r\n\r\nINSERT INTO test_enum\r\nVALUES('unknow');\r\n\r\n#\u5ffd\u7565\u5927\u5c0f\u5199\u7684\r\nINSERT INTO test_enum\r\nVALUES('UNKNOW');\r\n\r\n#\u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\u8fdb\u884c\u679a\u4e3e\u5143\u7d20\u7684\u8c03\u7528\r\nINSERT INTO test_enum\r\nVALUES(1),('3');\r\n\r\n#\u6ca1\u6709\u9650\u5236\u975e\u7a7a\u7684\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u6dfb\u52a0null\u503c\r\nINSERT INTO test_enum\r\nVALUES(NULL);\r\n\r\n# 9. SET\u7c7b\u578b\r\nCREATE TABLE test_set(\r\n    s SET ('A','B','C')\r\n);\r\n\r\nINSERT INTO test_set (s) VALUES ('A'), ('A,B');\r\n\r\n#\u63d2\u5165\u91cd\u590d\u7684SET\u7c7b\u578b\u6210\u5458\u65f6\uff0cMySQL\u4f1a\u81ea\u52a8\u5220\u9664\u91cd\u590d\u7684\u6210\u5458\r\nINSERT INTO test_set (s) VALUES ('A,B,C,A');\r\n\r\n#\u5411SET\u7c7b\u578b\u7684\u5b57\u6bb5\u63d2\u5165SET\u6210\u5458\u4e2d\u4e0d\u5b58\u5728\u7684\u503c\u65f6\uff0cMySQL\u4f1a\u629b\u51fa\u9519\u8bef\u3002\r\nINSERT INTO test_set (s) VALUES ('A,B,C,D');\r\n\r\nSELECT *\r\nFROM test_set;\r\n\r\nCREATE TABLE temp_mul(\r\ngender ENUM('\u7537','\u5973'),\r\nhobby SET('\u5403\u996d','\u7761\u89c9','\u6253\u8c46\u8c46','\u5199\u4ee3\u7801')\r\n);\r\n\r\nINSERT INTO temp_mul\r\nVALUES('\u7537','\u7761\u89c9,\u6253\u8c46\u8c46');\r\n\r\nSELECT *\r\nFROM temp_mul;\r\n\r\n# Data truncated for column 'gender' at row 1\r\nINSERT INTO temp_mul\r\nVALUES('\u7537,\u5973','\u7761\u89c9,\u6253\u8c46\u8c46');\r\n\r\n# 10.1 BINARY \u4e0e VARBINARY\u7c7b\u578b\r\nCREATE TABLE test_binary1(\r\n    f1 BINARY,\r\n    f2 BINARY(3),\r\n#     f3 VARBINARY,\r\n    f4 VARBINARY(10)\r\n);\r\n\r\nDESC test_binary1;\r\n\r\nINSERT INTO test_binary1(f1,f2)\r\nVALUES('a','abc');\r\n\r\nSELECT * FROM test_binary1;\r\n\r\n# Data too long for column 'f1' at row 1\r\nINSERT INTO test_binary1(f1)\r\nVALUES('ab');\r\n\r\nINSERT INTO test_binary1(f2,f4)\r\nVALUES('ab','ab');\r\n\r\nSELECT LENGTH(f2),LENGTH(f4)\r\nFROM test_binary1;\r\n\r\n# 10.2 Blob\u7c7b\u578b\r\nCREATE TABLE test_blob1(\r\n    id INT,\r\n    img MEDIUMBLOB\r\n);\r\n\r\nINSERT INTO test_blob1(id)\r\nVALUES (1001);\r\n\r\nSELECT *\r\nFROM test_blob1;\r\n\r\n# 11. JSON\u7c7b\u578b\r\nCREATE TABLE test_json(\r\n    js JSON\r\n);\r\n\r\nINSERT INTO test_json (js)\r\nVALUES ('{\"name\":\"songhk\", \"age\":18, \"address\":{\"province\":\"beijing\",\r\n\"city\":\"beijing\"}}');\r\n\r\nSELECT * FROM test_json;\r\n\r\nSELECT js -> '$.name' AS NAME,js -> '$.age' AS age ,js -> '$.address.province'AS province, js -> '$.address.city' AS city\r\nFROM test_json;\r\n\r\n\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[47],"class_list":["post-1549","post","type-post","status-publish","format-standard","hentry","category-mysql-code","tag-mysql"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1549"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1549"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1549\/revisions"}],"predecessor-version":[{"id":1550,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1549\/revisions\/1550"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1549"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1549"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1549"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}